I may have overlook this, but why isn't there a donate option on this site since the material is free? I would like this because is it doesn't limit everyone to only helping out professor messer by paying the money for the videos., and it gives more of an opportunity for revenue for the site to get better and for hard work to be rewarded in a more versatile payment option.

Although I really do appreciate the thought, I've intentionally not included an option to donate on the site. As long as people watch the videos, I'm happy!

The world isn't run by weapons anymore, or energy, or money. It's run by little ones and zeroes, little bits of data. It's all just electrons.
- Cosmo in Sneakers

If more people were like Professor Messer, we'd be living in a Utopian society. Thanks Professor!